Pneumatic tire casing



Aug. 1l, 1931. B. DARRow 1,818,944

PNEUMATIC TIRE CASING OriginalFld July 1l, 19277Y 2 Sheets-Sheet l FigA Fig?,

gwwzml'o'b Burgess Darrow 1\ WOT Aug. 11,1931. B. DARRow PNEUMATIC TIRE 4CSING original Filed Ju1y`11, 1927 2 sheets-sheet 2 S11/vento@ Burgess Dan-row NUNirEi'i STATES Patented Aug. 11, 1931 yPAIISNT OFFICE EURGEss DARROW, OE AKRON, OHIO, AssIGNORTO TRE GOODEEAR TIRE a RUBBER i COMPANY, OE AKRON OIIIO, A CORPORATION OE OHIO PNEUMATIC TIRE CAsING Originalapplication led July 11, 1927, Serial No.`204,842. Patent No. 1,732,793, dated October 22,1929.`

I Divided and this applicatonled June?, 1929; SerialY No. 369,031.

My invention relates to pneumatic tire casings and lit has particular relation to a method which shall be especially applicable in assembling the .component parts of such casings.

This application is a divisionalapplica' tion of Serial Number 204,842, filed July 11, 1927, which hasbecome Patent No.v 1,7 32,7 93, of Oc,tOber22,1929.` 4 v Y Y I One object of my invention is to provide a relatively inexpensively constructed pneumatic tirecasing. I i u Another object o'f-my invention is tofprof vide a pneumatic tire casing which may be constructed by a simplified method that permits the more extensive employment of well known machines. r

Prior to my invention, pneumatic tire casings` have been constructed by a method which involved principally, a progressive series of manual operations. Inpracticing the method,-a'toroidal core or' cylindrical drum has been employed upon-which the casing was assembled by manually superimposing the several elements of the casing. Each of the plies of' rubberized fabric material, of which .the carcass was constructed, extended continuously between the tire beadsrand `each required a separate trimming operation.l It is welllmown that thismethod of constructing tire casings is relatively expensive,lit being necessary to employ highly skilled workmen whose time is consumed in painstakinglyV Parformmg a. multim-101W Ofjtedlous Opera-; matic tire casing illustratingfdiagrammatii' tions.`v Y i i i A f According to the principles of my invention, atire casing is constructed in a plurality of vcircumferential sections. which `may be' quickly and easily assembled.A lThe sections of the casing may be` constructed, if desired, by machines which areat present being Aem ployed in a more limited capacity. For. a better understandingfof my inventionreference may now be had to the accom-` specification, in which :v .Y

Fig. l illustrates.diagrammatically a crosssectional view of a pneumatic tire casing con-` panying drawings, forming a part of this v structed according to the principles of myin-l vention;

Fig. 2 is a cross-sectional view illustrating one of the sections employed in the construe# tion of the pneumatic tire casing illustratedl byFg 'i Fig. 3 is a Vcross-sectional view illustrat"r-- ing the remaining section employed kin the construction of the pneumatic tire casing il-A lustrated by Fig. l; 1

Fig-4` is a cross-sectional View of a por.-4 tion of a carcass of a pneumatic tire casing illustrating another method of uniting the sections of the carcass in which the adjacent edges of the fabric strips are alternately lappedand spaced;

Fig. 5" is a cross-sectional view of a portion of a carcass of a pneumatic tire casing illustrating another `method of 'uniting the sections of the carcass in which the adjacent edges of the `fabric strips are substantially, overlapped; 1

Fig.y 6 is a cross-sectional view of a porf tion of a carcass of a pneumatic tire casing illustrating another method of uniting the sectioiisof the carcass which method is esployed in the identical;

Fig. 7 is a cross-sectional view of a pneu...

construction of the carcass are callyf another lform which my invention may assum`e;and ,Y Figs. .8y and9 are cross-sectional views il-1 lustrating-other methods of uniting the sections of the carcass as illustrated by Fig. 7.

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InA practicingjmy 'invention I employ aj pair of sections 10 and 11 composed of strips of rubberized 'fabric tire building material 12 vsupported by -a pair of tirebeads 13 and 1,4, ',The sections lOand l11 may be conf structed in any suitable manner, as for example, on a machine commonly known as a bead flipping machine. rIhis machine heretofore has been employed only for the purpose of applying a iipper strip indicated at l5. However, by properlyadjusting the mechanism of the machine employed in contracting the material engaging the inner periphery ci the beads. strips ci relatively greater width may-be similarly applied by the machine. Strips 16 land 17 lthat are superimposed upon the bead accordingly may be so applied. The margins 18 between theedges of'st'rips'of material may be'equal;

or unequal, as desired'. Gn the^bead flipping machine the desired margins maybe obtained by proper manipulation ofthe marginal adjustment.y

The sections l() Vandv lllare assembled .by

uniting the oppositely disposed marginal portions' thereof l and applying I pressure'in any suitable manner thereto.' To( accomplishy this-result I suggestfthe employment ofany well-L knownotire Vmachine having. a corel'or drum anda bead setter. The sectionsIO and 1l are properly positioned in the bead' setter of the machine'iand the mechanismoperated in thelusual manner .to cause the sections to` engagetheidrum or core." Thel stitcherot the carcass are spaced infstepped relation:

As illustrated by Fig. .4, the-edges are al-lV ternately lapped land spaced. In- Fig. 5 all ofthe edges are lapped. These `variations maybe obtainedon the bead vflip-ping machine by properly manipulatingfthe marginal adjustment and' by changing the=widthof the strips of material. y

If desired, a` tire carcass may be' constructed accordingv touny method by employing' two-sectionsthat=are identical rather than complementary as by employing two sections `fsimilar to vsection 10.l One ofthe sections is'reversed relativeto Vthe'otherand the tapered portions united as indicated by Fig'.l 6. Y

In1 fthe'embodiment of my invention illustrated by' Fig. 7,1.the-sectiions f1tand1lare constructed of relatively narrow." strips-of material and va section 21, composed of strips ofmaterial of unequal width 272, 23',- 24 and 25, is 'adapted' to be united withfthei sections l0 and l1. If it vvis desirable to assemblelthe sectionslO, 1l and 2l on a ltirejmachine, the plies 22` and 23 may be'stitched tothe-core or drum of the tire machine, eitherseparately or as a previously assembled unit. Thereafter, the sections at 10 and 11 are positioned by a bead setter on the margins between the edges of the strips. Flies 24 and 25 then are superimposed either separately or as a unit upon the portion of the carcass previously assembled. rl`he plies 22, 23, 24 and 25 may, ii desired, be assembled as a unit prior to their application to the core and the plies 23 and 24 separated to receive the sections 10 and 11.: y Y

In y the embodiment of the invention illustrated by Fig. 8, the sections 10 and 11 are adapted to be positioned immediately adjacentthe core ordrum Lof "the tire` machine and' thev section 21superi1nposed thereon.

rIhe vembodiment of the invention illustrated by Fig. 9 is constructed similarly to that illustrated by Fig- 8, except that the sectioni21`is vpositioned-onthe core or drum prior to the sections l() and 11.

It is apparent thatby the-:employmentlof my'invention', a `pneumatic-tire'casing maybe constructed largely by machines. Also a substantial savingof Vmaterial isrealized by the elimination of waste incidental-tothe trimming operationsheretofore necessaryjin constructing al pneumatic-'tirel casi-ng.

Although I-hav'e illustratedbut the.pre ferred forms which my invention may assum'eland-havefdscribed those forms in detai-l,lit will befapparent to those skilled in the art that it is not so limited /butothat various minor Y' modifications f andw changes may be made' therein j without departing from the spirit of my invention orfrom the scopeof theI appended claims.l

What I claim is:

l. Apneumatic4 tireca-rcalss comprising a plurality of distinct individualcircnmeren-f tiall-y extending 1sections,'-each.of thefsections comprising a'plurality of plies of fabric, the plies having marginal portions, each of which is progressively stepped from the amargins Lof the adjacent-plies whereby to `provide the sections with substantially feathered edges, the plies of one section enclosing a bead', the margins of thepliesof'one section substan-` tially registering with thel corresponding` margins of'th'e adjacent section to provide a splice of substantiallyl the same thickness as 'the adj-acentportions of `the carcass.

2.- A=pneumatic tirel carcass comprisingy a plurality of distinct yindividual circumferentialily extending-sections, veach of which constitutes one half of the carcass, the sections comprising a plural-ity ot plies of fabric, :the plies having marginal =portions each of .which is progressively stepped from the margins of the adjacent plies whereby to provide the sections with substantially feathered edges, the plies of one section enclosing. a bead, the margins of the plies' of one section substantially registering kwith the corresponding marginsof lthe adjacent sections to provide a spliceof substantially-the same Signed at Akron, in the county of Summit and State of Ohio, S. A., this 6th day of June, 1929.

In Witnesss whereof, I have hereunto signed my name.

BURGESS DARROW. 

